body {
  font-family: 'Arial', sans-serif;
  align-items: center;
  justify-content: center;
  height: 100vh;
  margin: 0;
  background: linear-gradient(135deg, #3498db, #8e44ad, #e74c3c, #f39c12);
  background-size: 400% 400%;
  animation: gradientAnimation 15s infinite;
}

@keyframes gradientAnimation {
  0% {
    background-position: 0% 50%;
  }

  50% {
    background-position: 100% 50%;
  }

  100% {
    background-position: 0% 50%;
  }
}

.converter {
  text-align: center;
  border: 1px solid #ccc;
  padding: 20px;
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.9);
  box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
}

.input-container {
  margin: 10px 0;
}

input,
select,
button {
  padding: 10px;
  margin: 5px;
  border: 1px solid #ddd;
  border-radius: 4px;
  box-sizing: border-box;
}

button {
  background: linear-gradient(45deg, #3498db, #8e44ad, #e74c3c, #f39c12);
  color: white;
  cursor: pointer;
  border: none;
  border-radius: 4px;
  padding: 10px 20px;
  font-size: 1em;
  transition: background 0.3s ease;
}

button:hover {
  background: linear-gradient(45deg, #f39c12, #e74c3c, #8e44ad, #3498db);
}